Solution of problem N4666 probability theory

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4666. There are products of four grades, and the number of products of each grade is, respectively, 2, 5, 2, 1. For control, 6 products are taken at random. Determine the probability that among them 1 is a first-class item, 3 is a second-grade item, 1 is a third-grade item, and 1 is a fourth-grade item.

Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)

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